You should have a Brake Wear Sensor that will give you the light on your dash when it's time to change brake pads.
DOT 4. Is the recommended brake fluid by Audi.
Replace the brake pads.
The brake light in the Audi A4 display means there is an issue with the brake system. The most common cause of this warning light is low brake fluid.
As of 2014, the cost for a Audi A4 brake light is between 12 and 15 dollars. This light can be purchased at stores like Auto Zone.
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My brake job on my A4- rotors and pads- $473.
To replace the rear wheel bearings on an Audi Quattro, start by safely lifting the vehicle and removing the rear wheel. Next, detach the brake caliper and rotor to access the wheel hub. Remove the hub assembly, then use a bearing puller to extract the old bearings from the hub. Install the new bearings, reassemble the hub, rotor, and caliper, and finally, reinstall the wheel, ensuring everything is torqued to the manufacturer's specifications.
It will say BRAKE on USA cars depending on the year. Or, it will flash an icon of a brake drum.
Just check your brake lite switch which is located at the brake pedal the switch might be broken that is why your brake lite is always on.
I don't know but that is a sweet ride
By going to the nearest service!